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NASA confirms 3I/Atlas, an interstellar comet from another star system, passed through our solar system in late 2025, captured by telescopes and spacecraft.
NASA has released close-up images of 3I/Atlas, the third confirmed interstellar comet to pass through our solar system, discovered in summer 2025.
The comet, estimated 1,444 feet to 3.5 miles wide, made a close approach to Mars in November 2025, passing within 18 million miles, and is now moving away after its closest point to Earth—about 167 million miles—in mid-December.
Multiple NASA and ESA spacecraft, including the James Webb Space Telescope and the Juice mission, captured data and images during its flyby.
Ground-based telescopes also observed the comet, visible in the predawn sky with binoculars.
Scientists say it originated from another star system, offering rare insights into interstellar material.
NASA dismissed online speculation it could be an alien spacecraft, reaffirming its focus on studying natural cosmic phenomena.
La NASA confirma 3I/Atlas, un cometa interestelar de otro sistema estelar, pasó a través de nuestro sistema solar a finales de 2025, capturado por telescopios y naves espaciales.